From: Gerardo Gregory [mailto:[EMAIL PROTECTED]
>
> Bowie Bailey wrote:
>
> > If there is no account information, how does the server know if a
> > user exists or not? How would it know to accept [EMAIL PROTECTED], but
> > reject [EMAIL PROTECTED] There has to be account information
> > somewhere.
>
> The relay will not accept the message from the smarthost. The primary
> system will return to your smarthost an error code. I snipped some
> logs for you to read. They are at the bottom of this email. You will
> see an incoming message to the smarthost with 8 recepients. 4 are
> ilegitimate and 4 are legit. The complete exchange might be a little
> off, but you should get the idea.
This is exactly the scenario I'm trying to avoid. If the smarthost
accepts mail for a non-existent user, then it has to deal with the
bounceback when the delivery fails. And with the volume of spam with
forged headers, this results in a large number of bouncebacks being sent
to non-existent users and non-existent domains.
What I need is a way for the server at the edge of my network to be able
to reject all non-legitimate mail. This gives the sending MTA
responsibility for the bouncebacks.
When "[EMAIL PROTECTED]" tries to send mail to "[EMAIL PROTECTED]", I
don't want my server to have to spend a week trying to deliver the
bounceback before giving up on the DNS resolution.
I'm also getting quite a few of these errors from Yahoo due to spam
bounces:
421 VS5-MF Excessive unknown recipients
It looks like what they are doing is temporarily suspending SMTP access
for servers who send mail to large numbers of non-existent accounts.
So what I'm trying to accomplish is to configure my network so that it
never accepts mail that is not deliverable.
Bowie
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